Dust arrester and collector



(No. Modem 3 sheetssheen 1.

' J. M. OASE.

DUST ARRBSTER AND COLLECTOR.

Nn. 575,824. Patented Jan. 26, 1897.

Jn, Cease.

me Nonms PETER; no, vworouwo. wAsmNGTnN, uv c.

No Model.) Y

. 3 sheets`-sheet 2. Jl Mu DUST ARR'ESTER AND COLLECTOR.

-Patented'Jam 26; 1897.

Ntra JOHN M. CASE, OF CINCINNATI, OHIO.

DUST ARRESTER AND COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 575,824, dated January26, 1897.

' Application filed July 3, 1896. Serial No. 598,016. (No model.)

To oir/ZZ whom, t may concern.-

Beit known that I, JOHN M. CASE, a citizen of the United States, and aresident of Cincinnati, in the county of Hamilton and State ot' Ohio,have invented certain new and useful Improvements in Dust Arresters andCollectors, of which the following is a specification.

My present invention is an improvement in that class of machines forwhich I have obtained Letters Patent No. 563,709, dated July 7, 1896,wherein the dust is collected by causing the dust-ladened air to passthrough a wall of filtering material of small component parts, which isrepeatedly treated to remove the dust therefrom and returned for reuse.

My present invention consists primarily in locating an agitator in theiiltering-Wall, so as to agitate the component parts of the ilteringmaterial and release the arrested dust without removing the material, asheretofore. In order to avoid interrupting the continuity of theprocess, the greater part of the filtering-wall is left at all timesintact, the agitator being confined in its operation at any given timeto a very small portion of the filteringbody, and in order that allparts of the filtering-body may be relieved of the arrested dust asoften as necessary a relative movement is produced between the agitatorand the body of ltering material either by moving the agitator while thebody of material remains stationary or by retaining the agitator in atixed position and moving the body of filtering material. The relativemovement is comparatively slow and the agitator is preferably such thatit makes its way through the body of material as the relative movementtakes place by causing the material in its immediate vicinity to feedpast it.. This has the effect of breaking up the pockets in which thedust has been arrested and permitting the air to blow out the arresteddust. It remains necessary only to provide for catching the dust whichis thus constantly being blown out along the restricted line of theagitator when the operation of collecting the dust is complete. This iseasily arranged by the employment of a shield which covers a suflicientportion of the iiltering-Wall directly over and adjacent to the agitatorto catch all dust which is released and blown through. inasmuch as allof the ilterin g material is continuously subjected to treatment by theagitator, but a restricted line of material being treated at any onetime, while all the rest of it remains intact for arresting the dust, itwill be seen that the dust arresting and collecting process is completeand continuous.

Uy present invention is capable of wide application. It is well adaptedfor use in connection with the cyclone type of lnachine, and when thusapplied it will permit the settlement by gravity of all the heavierparticles and then thoroughly remove from the air all the iinerparticles which generally escape in that type of machine. In applyingthe i11- vention to this type of machine I may either locate thefiltering medium, together with its agitator, directly in the walls otthe vortexchamber, or I may employ separate filteringwalls which willtit over the escape-opening of the ordinary cyclone-machine and treatthe air escaping therefrom to remove the dust which ordinarily returnst0 the atmosphere of the mill or is wasted.

My invention will be fully understood upon reference to the accompanyingdrawings, in which- Figure 1 is a vertical axial section of oneembodiment of my present invention, and Fig. 1n is a detail verticalsection on the line a a, Fig. 1. Figs. 2 and 3 are respectively avertical axial section and an end elevation of another embodiment of mysaid invention. Fig. 4 is a vertical axial section of another formembodyin g the invention, this igure illustrating the application oftheinvention to an ordinary cyclone dust-catcher, and Fig. 4"L is amodified form of the agitator which may be employed in Fig. 4 when thedust-arresting material is of a fibrous nature. Figs. 5 and 6 arerespectively a top plan of the form of machine shown in Fig. 4 and ahorizontal section through such a machine, the plane of section beingindicated by the line b b, Fig. 4. Figs. 7 and 8 are a vert-icaldiametric section and a detail view of another Jform.

Referring to Figs. 1 and la, 1 represents a settling-drum into which airmay be introduced through a tangential opening 2 to produce acentrifugal separation of the heavier particles from the dust-laden air.3 is a shaft mounted centrally within the drum l. and carrying thefan-motor 4 in position to receive IOO the impact of the current of airand imparting a rotary movement to the shaft 3. 5 is a sweep carried bythe shaft 3 and adapted to collect the heavier particles of materialwhich escape from the air by vertical action and to discharge saidparticles through a spout G. The chamber 1 has an end opening 7. In somuch of the machine there is nothing particularly novel.

Mounted over the cylinder] and in position to receive the air whichescapes therefrom is a filtering-chamber S, formed with double walls 9and 10, the space between which is filled with a filtering material 11.The walls 9 and 10 are perforated, and the air which rises out of thecylinder l escapes through such perforations and finding its way throughthe small pockets or interstices between the component parts of thefiltering material passes to the outside. Any dust, however fine, whichis suspended bythe current of air lodges inthe pockets between thecomponent parts of the material and is there arrested.

12 is a sweep carried by the upper portion of the shaft 3, which extendsthrough the chamber Sand serves to sweep from the inner surface of thewall 9 those particles which adhere to said wall, and at the same timeprevents clogging of the perforations in said wall.

13 is an agitator mounted upon a shaft 14, whose upper end turns in abracket 15, while itslower en d carries a f riction-roller 1G, whichfits in the space between the walls 9 and 10. A bevel-gear 17 on shaft1l meshes with a bevel-gear 1S on a drive-shaft 19 and thereby transmitsrotary movement. from the said shaft- 19 to the shaft 14. The shaft 19is mounted in brackets 20 and has a drivingpulley 21.

22 represents a shield which corresponds in position to the agitator 13and covers the portion of the wall ll which is opposite said agitator,so that the air which escapes at this pointis directed down and out at aspout 23.

The agitator 13 is such that it stirs up or agitates the component partsof the filtering material and breaks up the pockets in which the dusthas lodged, so that the air passing through the filtering-wall along theline of the agitator carries with it the dust which has from time totime lodged among the particles of filtering material, and escaping intothe shield 22 may be collected at the spout The construction of theagitator 13 is also such that by its rotation the material adjacent toit is gradually fed along, so that if a relative movement is producedbetween the agitator and the whole body of the filtering material all ofsuch material will gradually come to be treated by the agitator and thusrelieved of all of the dust accumulated in it and passed on to repeatthe operation of arresting the dust. It will be seen that the agitatoronly disturbs the material in its immediate vicinity, and that as thisis only a very small section of the material the main body of theiiitering-wall is at all times ready for the passage of the dust-ladenaii` and in condition to arrest the dust.

In order to produce the relative movement necessary to bring all partsof the filteringwall successively under the cleansing influence of the.agitator, the form of machine shown in Fig. 1 has means for continuallyadvancing the body of material while the agitator remains stationary. Toaccomplish this purpose, the chamber 8 is supported by balls 24 upon thecylinder 1, whereby it may readily turn thereon, and the shaft 19carries an eccentric 25, which operates a pawl 2U, resting upon theratchet edge 27 of the outer wall 10, so that for each revolution of theshaft 19 the chamber S, with its contents, willbe advanced slightly, soas to bring a new portion of the filtering material constantly withinthe reach of the agitator.

In Figs. 2 and 3 is shown a form of machine made on the basis of thehorizontal cylinder 8a, having double perforated walls il 10, containingthe filtering material 11 and receiving the dust-lac'len air through atangential inlet 2, while the heavier particles, which settle bycentrifugal force, escape through the spout G, 13 13 are two agitatorssimilar to that described in Fig. 1 and meshing by gears 17 17*rl ontheir shafts and the gears 18l 18 on'a shaft 19% so as to receive motionfrom a pulley 21, et represents a fan-motor upon the hollow shaft 30, soas to assist in imparting rotary movement to said shaft, and 12Art aresweeps carried bysaid shaft for keeping the inner faces of thecylinder-head clear. 22 221L are shields, which are carried by hollowshaft 30, so as to be held in position over the agitators 13 and toreceive the dust dislodged by said agitators and deliver the same intothe hollow shaft 30, from whence it escapes through a spout 3].. Byreason of the nature of the gearing 17IL 1S and of the action of the airupon the fan-motor l1 a slow rotary motion is imparted to said shaft 30,together with all the parts carried by it, said motion being governed bythe feeding action of the agitator 13, as hereinbei'ore explained. Theresult is that while the walls D and 10, together with the inclosedmaterial 1l, rcmain stationary the agitators 13 will gradually passaround through said material and treat all parts of it successively anda little at a time, while leaving the remainder in condition to arrestthe dust from the air which is passing through the walls. 32 32arcstandpipes, through which material is introduced, and which may be keptfilled to replace shrinkage by wear and keep the material under properpressure and in packed condition in the machine.

In Figs. 1t, 5, and G is shown a form of machine adapted to be mountedover an ordinary cyclone dust-catcher. The dust-catcher IOO IOS

IIO

IIS

of double perforated Walls 9b 10h, having the space between them lilledwith the ilter'mg material 11. 36 represent-s a shaft which carries afan-motor 4b in the settling-chamber 33 and an angularly-arranged sweep37 in the chamber 35. On its upper end the shaft carries a gear-wheel 38and a drive-pulley 39.

with the parts carried by it, slowly travel around the cone-shapedchamber 35. 42 represents a trip-valve, which normally closes the lowerend of the shield 22h, so as to prevent the escape of the dust, butwhich is engaged and opened Yby a projection 43 each time the shield 22hcomes opposite a fixed spout 44. 45 is a spout leading from the floor ofthe conical chamber and serving to deliver into the spout 44 thematerial which settles in chamber 35.

In Figs. 7 and 8 is shown an upper centrifugal sifting-chamber 50,having a tangential inlet 51 for dust-laden air and a spouted outlet 52for escape of heavier particles which are separated by centrifugalforce, and beneath the eye of the settling-chamber is chamber 53,

having a rotatable drum 54 with a single perforate bottom 55, upon whichrests abody of filtering material 11. The air escaping from chamber 50passes downward through filtering material 11 and all remaining dust isarrested. 56 is an agitator, comprising a rake pivoted by its back at 57and receiving a rocking motion from an arm 58, engaged by crank 59 ofshaft 60, which is rotated by pulley 6l.

v The rocking movement thus imparted to the rake agitates the tilterin gmaterial sufficiently to permit the escape of arrested dust fromtherestricted area of agitation, while the major part of the materialremains in condition to arrest the dust from the escaping air, and thearrested dust which is dislodged by agitator 56 is collected in shield22c and discharged through spout 62 by the conveyer 63 on shaft 60. Apawl 64 on the agitator 56 engages a peripheral ratchet 65 on the drum54, and each time the agitator vibrates advances the drum by the spaceof one tooth. By this means the entire body of filtering material isbrought under the cleansing action of the agitator from time to time,while the operation of arresting the dust goes on uninterrupted. 66 isthe turning-post of the drum, stepped in the bearing 67 and carryingat-its upper end aswivelbearing 68 for the agitator. 69 is a packingclosing the crack between drum 54 and the wall of chamber 53.

A filtering material which is well adapted for the purposes of myinvention is grain of various kinds or other material of similar form.Another material which will serve the purpose well is fiber of variouskinds. If it is desired to use liber as a filtering material, theagitator 13, as shown in Fig. 4a, should be used. This consists, asshown, of a shaft having short teats or projections, whichwill pick overthe fiber so as to release the material therefrom and permit its escapein the manner hereinbefore explained.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

1. A dust-catcher comprising a stationary wall of air-iiltering materialthrough which the dust-laden air is passed and an agitating devicelocated within the said wall in a restricted portion thereof forseparating the dust taken up by the wall from the latter;

` substantially as described.

'2. A dust-catcher comprising a filteringbody through which thedust-laden air is forced and by which the dust in said air is arrested,an agitator, located within the said filtering-body in a restrictedportion thereof for agitating the component parts of the filtering-bod ysurrounding it, to permit the escape of the dust arrested thereby, andmeans for producing a relative movement between the agitator and thebody of liltering material,

whereby all parts of the latter are successively relieved of their dust,as explained.

3. A dust-catcher comprising a wall of airltering material, an agitatorlocated within and operating upon a restricted portion of the filteringmaterial to produce relative move- ,ment between the component parts andrelease the arrested material therefrom and permit its discharge by thecurrent of air, a conducting-passage corresponding in position to theagitator and receiving and conducting away the dust released by thelatter, and means for effecting a relative movement between the body ofmaterial and the agitator and conducting-passage whereby all parts ofsaid material are successively treated, as explained.

4. A dust-catcher comprising a settlingchamber, means for delivering acurrent of dust-laden air into said settling-chamber in a mann er toproduce a vortical movement and cause the settling of the largerparticles suspended in the air, a filtering-wall through which the airbearing the finer particles is subsequently forced and by which saidliner particles are removed from the' air as explained, and an agitatorlocated within the wall in a restricted portion thereof.

5. In a dust-catcher, the combination of a circular chamber havingdouble perforated walls, a body of filtering material located betweensaid walls, an agitator comprising a shaft having projections which tendto feed the material relatively to the shaft when the latter is rotatedand means substanptially as described for rotating said shaft asexplained.

6. In a dust-catcher,A the combination of a ICO IIO

circular chamber formed of double perforate walls and having a spacebetween them iilled with a filtering medium made up of small componentparts, a shaft mounted concentrically in said chamber and a shaftprojecting,` radially from said concentric shaft, projecting into thebody of filtering material, having projections which agitare saidmaterial, and adapted to be moved progressively through saidn1aterial,by the concentric shaft, as explained.

7. 1n a dust-collector the combination of a chamber formed of doubleWalls perforated for the escape of air from the chamber and having aspace between them filled with a liltering` medium made up of smallparts, a shaft mounted to rotate concentrically in the cham* ber, anagitator geared to the concentric shaft and projecting radially from thesame, into the body of filtering material between the Walls, andprovided With projections which cause a progressive movement of theshaft through the material when rotated, as eX- plained.

8. In a dust-collector the combination of a chamber formed with doubleWalls perforated for the passage of air through them and haw ing,` aspace between them filled with a filtering medium of small componentparts, a central shaft in the chamber, an agitating-shaft receivingmovement from the central shaft and projecting from the latter into thebody of iiltering material and a brush moving over the face of the innerWall of the chamber to clear the same and receiving motion from saidcentral shaft, as explained.

9. in a dust-collector the combination of a hood formed with doubleperforated walls, and supplied between said walls with a layer ofmaterial and an agitator located Within the material in a restrictedportion thereof, said hood being adapted to be placed over theair-outlet of an ordinary centrifugal d ust collector, whereby the tineparticles of dust are arrested, as explained.

JOIIN M. CASE.

Witnesses:

Il. S. KNIGHT, F. R. PRocToR.

